Barrel-type friction-changing damper

Abstract

The invention relates to a cylinder-type variable friction damper, and can be used for building structure damping control and locomotive damping. The invention comprises an outer sleeve, a first friction sleeve, a second friction sleeve, a sliding axle, a disk spring, a locknut, an extrusion cone ring and a friction slip. An inner sleeve comprises the second friction sleeve and the first friction sleeves arranged on both ends of the second friction sleeve. The inside diameters of the first friction sleeve and the second friction sleeve are arranged on the same cylindrical surface. A left end plate and a right end plate having a hinge are permanently connected on the left end and the right end of the inner sleeve and the outer sleeve. During the deformation course of the cylinder-type variable friction damper, the area of the contact face which actually provides the frictional resistance varies with the deformation of the damper; the positive pressure on the complete contact face is kept unchanged. In this way, the friction is variable. The damper has the characteristic of linear damping. The capability of dissipation of energy increases with the increase of the deformation amplitude. When the invention is used for damping control of building structures, the invention can meet the requirement for damping under strong vibration and weak vibration, and has high practical application value.

Description

technical field [0001] The invention relates to a cylinder type variable friction damper, which can be applied to vibration reduction control of building structures and vibration reduction of locomotives. It can also be used to make dampers used in aerospace, electronics, chemical industry, energy, instrumentation, medical treatment, sanitation and other fields. Background technique [0002] The friction damper is a kind of control device that uses the frictional energy dissipation of the friction surface to dissipate the vibration energy. Friction surfaces for friction dampers in construction typically include steel-bronze, steel-steel, and heavy-duty brake linings. The core part of a common friction damper is one or more pairs of friction surfaces with a certain preload. The external force needs to overcome the friction between the friction surfaces to drive the relative motion of the friction surfaces of the damper. The preload and the properties of the friction surface...

AI Technical Summary

Problems solved by technology

[0008] 1) Although the pseudo-viscous damper can produce a hysteretic curve similar to that of the viscous damper, its maximum value is still fixed, which is the main difference from the viscous damper, so the damper still has conventional frictional damping The device cannot adapt to the defect of strong vibration and weak vibration at the same time;

[0009] 2) Although the performance of the semi-active friction device is superior, the structure of this type of device is complex, the cost is high, and the maintenance requirements are high, so it is currently impossible to popularize it;

[0010] 3) The centripetal friction damper has an exquisite structure, but since the positive pressure on the friction surface mainly comes from the spring in the middle, as shown in Figure 1.(c), in order to obtain the tonnage and deformation capacity required for the vibration reduction of the building structure, The spring in Figure 1.(c) needs to have great stiffness and large deformation capacity at the same time. If a coil spring is used, the deformation capacity can be satisfied, but it is difficult to obtain a large stiffness that meets the requirements;

[0011] However, if disc springs are used, the stiffness requirements can be met, but the deformation capacity requirements are not easy to meet.

In short, for the centripetal friction damper, it is difficult to meet the requirements of large tonnage and large deformation capacity at the same time. Therefore, the damper can be used for vibration reduction of small equipment, but cannot meet the requirements of building structures.

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